CE12804s BFD down cause OSPF peer down

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Issue Description
The OSPF peer state is not stable on CE12804s, and the alarm shows that the OSPF peer down cause by BFD session down.
transparent.gif Alarm Information

<Huawei>display ospf peer last-nbr-down

Neighbor Ip Address : x.x.x.x

Neighbor Area   Id  : 0.0.0.2

Neighbor Router Id  : x.x.x.x

Interface           : Vlanif2015 (200)

Immediate Reason    : Neighbor Down Due to Kill Neighbor

Primary Reason      : BFD Session Down

Down Time           : 2018-03-05 03:21+08:00


The status of the non-virtual neighbor has changed. (RouterId=x.x.x.x, NbrIpAddress=x.x.x.x, NbrAddressLessIndex=0, NbrRtrId=x.x.x.x, NbrState=1, ProcessId=5, AreaId=0.0.0.2, IfnetIndex=217, LocalIfIpAddress=x.x.x.x, IfName=Vlanif2034, VpnName=vpn-sigtran, Reason=BFD session state change, SubReason=BFD Session Down)

transparent.gif Handling Process

1.   With command display bfd running-info session command, it shows that the reason of bfd down is local down, and the local down because of didn’t receive bfd from peer device.

 

2018-03-05 03:21:695  FEI notify.(MD=16408,YD=16396,CfgTX=100,CfgRX=100,CfgDM=3,ActTX=200,ActRX=200,ActDM=3,State=3,P=0,F=0)

2018-03-05 03:21:695  FEI notify session DOWN.(MD=16408,YD=16396,Diag=1,Seq=16973569)

2018-03-05 03:21:695  Session DOWN.(MD=16408,YD=16396,Dia=1,Reason=0,State=3,FeiDownCount=1)

2018-03-05 03:21:697  Notify App(0x8204be):State=1,SubState=0x40000.

2018-03-05 03:21:715  FEI notify.(MD=16440,YD=16392,CfgTX=100,CfgRX=100,CfgDM=3,ActTX=200,ActRX=200,ActDM=3,State=3,P=0,F=0)

2018-03-05 03:21:715  FEI notify session DOWN.(MD=16440,YD=16392,Diag=1,Seq=16973569)

 

2. Checking the configuration, BFD detect interval is 3*100ms, it is too short, recommend set to 3*1s.

interface Vlanif2013

ip binding vpn-instance vpn-sigtran

ip address x.x.x.x 255.255.255.240

ospf dr-priority 100

ospf bfd enable

ospf bfd min-tx-interval 100 min-rx-interval 100


transparent.gif Root Cause

BFD detect interval is 3*100ms, it is too short, recommend set to 3*1s.

transparent.gif Solution

Set BFD detect interval to 1s


interface Vlanif2013

ospf bfd min-tx-interval 1000 min-rx-interval 1000

transparent.gif Suggestions

On CE switch, BFD process by software, the recommand detect interval is 3*1s.

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